multiview: first 12 cleanup commits from review:

*  rename Bluray to Blu-ray

* code cleanup
(note: the original code was copied from RenderLayers, so I gues it's
not required there either. Better handled in trunk though)

* change description for Scene Render View

* change tooltip description for SceneRenderView->camera

* code cleanup

* renaming "View Switch" to "Switch View"

* correct file name in comment

* MEM_guardedalloc.h already has extern "C"

Note: COM_OutputFileOperation.cpp has the same issue. To be cleaned in
trunk though.

* remove unused view_name

* blank space cleanup

* removed unused function BLI_last_period

* remove outdated comment